Joe Biden's 5 best debate lines

The one and only debate between Vice President Joe Biden and GOP vice presidential nominee Paul Ryan quickly turned testy in Kentucky on Thursday night. Here’s a look at some of Biden’s most memorable lines:

4. “In case you haven’t noticed, we have strong disagreements, but you probably detected my frustration with [Romney and Ryan’s] attitude about the American people.”

5. “There are things that have occurred in this campaign, in every campaign that I’m sure both of us regret… particularly in these special new groups that can go out there, raise all the money they want, not have to identify themselves, and say the most scurrilous things about the other candidate. It’s an abomination.”